Insulating-coupling



(No Model.)

. O. F. HUMMEL.

INSULATING COUPLING.

No. 592,930. Patented Nov. 2, 1897.

WITNESS INVE T 03 dfl u l1 TTOHNEY T NITED STATE PATENT scion,

CHARLES FREDERICK HUMMEL, OF BROOKLYN, NEW YORK.

INSULATING-COUPLING.

SPECIFICATION forming part of Letters Patent No. 592,930, dated November 2, 1897.

Application filed March 2 Z, 1 8 9 7.

To all whom it may concern:

Be it known that I, CHARLES FREDERICK I-IUMMEL, a citizen of the United States, residing at Brooklynyin the county of Kings and State of New York, have invented certain new and useful Improvements in Pipe Joints or Couplings, of which the following is a full and complete specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to insulating joints or couplings for use in connection with gas pipes or fixtures or other analogous purposes; and the object thereof is to provide an improved joint or coupling of this class which is particularly adapted for use in connection with gas-fixtures wherein electric wires are conducted through the fixtures for various purposes; a further object being to provide an insulating joint or coupling which will af- "ford absolute insulation between the suspended portions of the fixtures and the system of gas-pipes; a further object being to so arrange the parts of the joint or coupling as to simplify their relation, and to make such apparatus detachable and readily accessible at all times for repairs and other purposes.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms apart, said drawing being a central transverse section of a pipe joint or coupling constructed according to my invention.

In the drawing forming part of this specification the separate parts of my improvement are designated by numerals of reference, and in the practice of my invention I provide two similar coupling-heads 5, each of which is provided with a screw-threaded central cylindrical bore 6, and at the inner ends these central longitudinal bores are reduced in size, each coupling-head at its inner end being provided with an inwardlydirected annular flange or rim 7. Each of the coupling-heads 5 is also conical in form, the smaller ends thereof being directed outwardly, and placed between said coupling-heads is a disk or plate 8 of insulating material, in the center of which may be formed an opening 9. Each of the coupling-heads 5 is also provided with a casing 10 of insulating material,which is placed .with that on the sleeve 11.

Serial No. 628,670. (No model.)

thereon, and I also provide a screw-threaded sleeve 11,which is adapted to be'placed upon one of said coupling-heads over the insulating-casing 10, and a coupling-sleeve l2,which is adapted to be placed upon the opposite head, and this sleeve 12 is provided with an annular rim 13, which is screwthreaded on its inner surface, as shown at 14, the screwthread on the rim 13 being adapted to engage As thus constructed it will be seen that the sleeves 11 and 12 are insulated from the coupling-heads 5, and said coupling-heads 5 are insulated from each other, and the form of the couplingheads or of the inner ends'of the central bores 6 formed therein is such that the metal pipes securedthereinto cannot bebrought in contact, this result being accomplished by the inwardly-directed flanges 7 at the inner ends of said coupling-heads. are also so formed that when coupled tightly together,which operation is accomplished by revolving either of said sleeves, said heads do not come in contact with each other or with said sleeves at any point, and the central opening in each of said sleeves is, as clearly shown, conical in form, so as to correspond with the form of said coupling-heads.

The insulating disk or plate 8 and the in sulating-casings 10 of the coupling-heads may be made of any desired thickness, and it will thus be seen that I accomplish the object of my invention by means of a device which is simple in construction and operation and perfectly adapted to accomplish the result for which it is intended.

Having fully described my invention, I claim as new and desire to secure by Letters Patent 1. A pipe joint or coupling, consisting of two similar coupling-heads, each of which is conical in form, and provided with a screwthreaded central bore at the inner end of which is an inwardly-directed annular flange, an insulating plate or disk placed between said coupling-heads, an insulatingcasing mounted on' each of said coupling-heads, and two sleeves fitted respectively upon said coupling heads over said insulating casings, and one of said sleeves being provided with an annular rim which is screw-threaded and The heads 10 and 12 adapted to engage with a corresponding thread formed on the other sleeve, substantially as shown and described.

2. A pipe joint or coupling, consisting of two similar coupling-heads, each of which is conicalin form, and the smaller ends of which are directed outwardly, each coupling-head being also provided with a screw-threaded bore at the inner ends of which are formed inwardly-directed annular flanges, an insulating plate or disk mounted between said coupling-heads, conical insulating-casings mounted upon each of said heads, and two sleeves fitted respectively upon said co uplingheads, and one of said sleeves being provided with an annular screw-threaded rim which is adapted to engage with a corresponding thread formed on the other sleeve, substantially as shown and described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of the subscribing witnesses, this 20th day of March, 1897.

CHARLES FREDERICK ll UM M EL.

\Vitnesses:

O. GERST, L. M. MULLER. 

